Ultrahigh Step-up DC–DC Converter for Distributed Generation by Three Degrees of Freedom (3DoF) Approach

Full text

(1)

Ultrahigh Step-up DC–DC Converter for Distributed Generation by

Three Degrees of Freedom (3DoF) Approach

Keshetti.Samatha, Mr. A.Anil Kumar, Dr.M. Ramesh

1.Pg Scholar, Department of EEE, Vaageswari College of Engineering, karimnagar. 2.Associate Professor, Department of EEE, Vaageswari College of Engineering, karimnagar

3. Professor&Hod, Department Of EEE, Vaageswari College Of Engineering, Karimnagar.

ABSTRACT-This paper shows an interleaved nonisolated DC-DC converter with high voltage pick up and zero voltage exchanging (ZVS) execution. Both coupled inductor and voltage multiplier cell (VMC) systems are utilized to expand voltage pick up. The ZVS circuit is made out of a dynamic brace which is in arrangement with the yield channel capacitors. This will offer ascent to encourage augmentation of the voltage pick up. Applying the interleaving system at the contribution of the converter, the swell of the information current is diminished. Because of the spillage inductances of coupled inductors, the diodes are killed under zero current exchanging (ZCS) condition. Subsequently the switch current recuperation issue is lightened. The unfaltering state investigation of the proposed converter is additionally displayed. At long last, a 900V-415W research facility model is actualized to approve the execution of the proposed converter. File Terms-High voltage increase, zero voltage exchanging, coupled inductor, voltage multiplier cell, dynamic clip.

I. INTRODUCTION

(2)

recuperation issue likewise must be managed. Late inquires about have proposed different non-disengaged converters to conquer the burdens of the regular lift converter. These arrangements can be sorted into three techniques; voltage multiplier cell (VMC) [3]-[8], coupled inductor [9]-[10] and their mixes [11]-[18]. The converter can achieve high voltage pick up at low obligation cycles and the voltage worry crosswise over semiconductors is decreased. In any case, the primary downside of these converters is hard exchanging operation that points of confinement productivity change. In addition, input current is beat and vast, which offer ascents to expand the info capacitors and influence the PV and FC use life. Interleaving method has been effectively utilized for limiting information current swell The dynamic clip can be used for delicate exchanging operation of the coupled inductors based converters with (or without) VMCs [25]-[30]. The proposed converter in utilizes an inductor at the info and works in nonstop conduction mode (CCM). The voltage is expanded by means of both coupled inductor and VMC systems. A CCM help cell gives the persistent information current to the proposed converter Where the information current swell is generally low. To build the voltage advance up proportion, the yield of the coupled inductor is laid on the highest point of

(3)

current swell is low and the converter can accomplish high voltage pick up by embeddings more phases of VMCs. Be that as it may, the main level of opportunity for voltage pick up expansion is the quantity of VMCs. Source impedance systems can likewise be utilized for voltage advance up. A novel high voltage A-source impedance connect with nonstop info current is proposed in [35] that uses an autotransformer for voltage pick up augmentation. Be that as it may, the most extreme reasonable obligation cycle in these sorts of converters is identified with the. Individual utilize is allowed, however autotransformer turns proportion, conversely. This paper proposes a novel interleaved ZVS high advance up DC-DC converter with the accompanying fundamental highlights: 1-High voltage pick up and low voltage worry over the semiconductors 2-ZVS operation of the power MOSFETs 3-ZCS kill of the diodes and reducing of turn around current recuperation issue by spillage inductances 4-Low information current swell because of interleaving impact 5-The dynamic clasp circuit takes an interest in voltage advance up. This paper is sorted out test confirmation with a plan case is displayed.

II. PROPOSED CONVERTER AND

PRINCIPLE OF OPERATION

(4)

both of the obligation cycle and coupled inductor/). Because of arrangement association of theturns proportion ( 2 1 N NN VMCs, the voltage worry over the diodes is diminished. Moreover, it can be controlled by coupled inductors turns proportion. To disentangle the investigations following suppositions are made:

1) All capacitors are sufficiently expansive to guarantee steady voltages amid one exchanging period.

2) The power gadgets are perfect, however the parallel capacitors of the power MOSFETs are considered. Key waveforms and the comparable circuits of the proposed converter amid one exchanging cycle are appeared

Mode 1 converter in this mode is appeared in Fig. 3(a).Power MOSFETs 1 S and 2 S are in turn-on state and all other semiconductors are in turn-off statewhere LK and Lm are the leakage and magnetizing inductances of the coupled inductors, respectively The equivalent circuit of the proposed

Fig. 1.Circuit configuration of the proposed converter.

(5)

Mode 3 converter in this mode is shown in Fig. 3(c). At time 2 t , the drain-source voltage of MOSFET 2 S reaches to V Co1 which causes the anti-parallel diode of MOSFET a 2 S to conduct. Therefore, it can be turned on at this instant to realize ZVS. ]: The equivalent circuit of the proposed

Mode 4 converter in this mode is shown in Fig. 3(d). At time 3 t , the gate signal is applied to MOSFET a 2 S and it is turned on under ZVS condition. The current Lk 2 i is still decreasing. Capacitors, Cr11 and Cr12 are charged and the load is supplied via capacitors Cr 21 and Cr 22 , secondary and tertiary windings of the coupled inductors. Thus capacitors, Cr 21 , Cr 22 are discharged. It should be mentioned that when the direction of Lk 2 i is reversed, a further

equivalent circuit has to be consideredThe equivalent circuit of the proposed

III. STEADY-STATE ANALYSIS OF THE PROPOSED CONVERTER

(6)

modes IV and V, the energy of the leakage inductor

Lk is released to the clamped capacitor C1.

According to previous work [15], the duty cycle of

the released energy can be expressed as

Where Ts is the switching period, Dc1 is the duty

ratio of the switch, and tc1 is the time of modes IV

and V. By applying the voltage-second balance

principle on Lm, the voltage across the capacitor C1

can be represented by International Journal of

Modern Engineering

IV CONCLUSION

This paper proposed a novel, high proficiency, and high advance up DC– DC converter connected to AC stack with the assistance of inverter. By utilizing the capacitor charged in parallel and released in an arrangement by the coupled inductor, high advance up voltage pick up and high productivity are accomplished. The relentless state investigations of voltage pick up and limit working condition are talked about in detail. A model circuit of the proposed converter is worked in the MATLAB/SIMULINK condition. The voltage weight on the principle switches is 90V; along these lines, low voltage appraisals and low on-state protection levels RDS (ON) switch can be chosen. Also, the proposed converter has basic structure.

References

[1] Yi-Ping Hsieh, Jiann-Fuh Chen, Tsorng-Juu Liang and Lung-Sheng Yang. “A Novel High Step-Up DC–DC Converter for a Microgrid System”.IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 26, NO. 4, APRIL 2011

(7)

[3] C. L. Chen, Y. W, J. S. Lai, Y. S. Lee, and D. Martin, “Design of parallel inverters for smooth mode transfer microgrid applications,” IEEE Trans. Power Electron., vol. 25, no. 1, pp. 6–15, Jan. 2010.

[4] A. Timbus, M. Liserre, R. Teodorescu, P. Rodriguez, and F. Blaabjerg, “Evaluation of current controllers for distributed power generation systems,” IEEE Trans. Power Electron., vol. 24, no. 3, pp. 654–664, Mar. 2009.

[5] Y. A.-R. I. Mohamed and E. F. El Saadany, “Hybrid variable-structure control with evolutionary optimum-tuning algorithm for fast grid-voltage regulation using inverter-based distributed generation,” IEEE Trans. Power Electron., vol. 23, no. 3, pp. 1334–1341, May 2008. [6] Y. A.-R. I. Mohamed and E. F. El Saadany, “Adaptive decentralized droop controller to preserve power sharing stability of paralleled inverters in distributed generation microgrids,” IEEE Trans. Power Electron., vol. 23, no. 6, pp. 2806–2816, Nov. 2008.

[7] Y. W. Li and C. -N. Kao, “An accurate power control strategy for power electronics interfaced distributed generation units operating in a low voltage multibusmicrogrid,” IEEE

Trans. Power Electron., vol. 24, no. 12, pp. 2977–2988, Dec. 2009.

[8] H. Karimi, A. Yazdani, and R. Iravani, “Negative-sequence current injection for fast islanding detection of a distributed resource unit,” IEEE Trans. Power Electron., vol. 23, no. 1, pp. 298–307, Jan. 2008.

[9] T. Shimizu,K.Wada, andN.Nakamura, “Flyback-type single-phase utility interactive inverter with power pulsation decoupling on the dc input for an ac photovoltaic module system,” IEEE Trans. Power Electron., vol. 21, no. 5, pp. 1264–1272, Sep. 2006.

[10] L. Palma, M. H. Todorovic, and P. Enjeti, “A high gain transformer less DC–DC converter for fuel-cell applications,” in Proc. IEEE Power Electron. Spec. Conf. (PESC), 2005, pp. 2514– 2520.

(8)

KESHETTI.SAMATHA,

Pgscholar,department of eee

Vaageswari

College

ofEngineering,

Karimnagar, Telangana

Mr. A.Anil Kumar, working as senior

Associate Professor in Vaageswari

College ofEngineering, Karimnagar,

Telangana. He received the AMIE

graduate degree in ElectricalEngineering.

And he received M.Tech in Electrical

Power systems specialization from

JNTUAnantapur

A.P.

At

present,

pursuing Ph.D from JNTU Hyderabad.

He has rich experience of 20 years in

teaching for Engineering students at UG

and PG level. His areas of interest

arePower Systems, Network Theory,

Power

Electronics

and

Electrical

Machines etc.

Dr.M. Ramesh was born in Guntur District, Andhra Pradesh, on 07-06-1977. I completed

myB.Tech. (EEE) from Viswanadtha Institute of Technology and Management affiliated Jawaharlal Nehru Technological University, Hyderabad in 2002, M. Tech.(Advanced Power Systems) from Jawaharlal Nehru Technological University, Kakinada, Andhra Pradesh in 2005 and completed Ph.D.(Application of Artificial Intelligent Techniques for Enhancement of Stability in HVDC Transmission System) from Jawaharlal Nehru Technological University College of Engineering, Ananthapuram in 2017. I have one year of Industrial experience and 15 years of teaching experience and presently working as a Professor and HOD, EEE Dept, Vaageswari College of Engineering, karimnagar Dist. I published 30 International Journals to my credit. I published 10 International and National papers in various conferences held at India and also abroad. My research interests are AI Techniques, Power Systems & FACTS. I have Member in IEEE, Life Member of Indian Society of Technical Education (M.I.S.T.E), Life Member International Association of Computer Science and

Figure

Updating...

References

Updating...

Download now (8 pages)
Related subjects : Three degrees of freedom